The public domain version of the NAPL Depletion Model is provided free of charge, without technical support.

Porewater Solutions does offer a support service if you would like expert assistance with developing the conceptual model, setting up NDM input files and processing NDM output files, or expert peer review.

There are two simple options for this support service:

US$500 for three hours of expert support from the program author; or

US$1,000 annual license which entitles you to 10 hours of expert support from the program author over a one-year period.